Qt dll Tester linker errors

2>------ Build started: Project: Tester, Configuration: Debug Win32 ------
2>Moc'ing Tester.h...
2>Compiling...
2>stdafx.cpp
2>Compiling...
2>moc_Tester.cpp
2>Tester.cpp
2>main.cpp
2>Generating Code...
2>Compiling...
2>qrc_Tester.cpp
2>Linking...
2>stdafx.obj : error LNK2019: unresolved external symbol "__declspec(dllimport) public: __thiscall MSpinLock::~MSpinLock(void)" (__imp_??1MSpinLock@@QAE@XZ) referenced in function __unwindfunclet$??0_MLockEx@@QAE@PBD@Z$0
2>stdafx.obj : error LNK2019: unresolved external symbol "__declspec(dllimport) public: int __thiscall MSpinLock::Init(void)" (__imp_?Init@MSpinLock@@QAEHXZ) referenced in function "public: __thiscall _MLockEx::_MLockEx(char const *)" (??0_MLockEx@@QAE@PBD@Z)
2>stdafx.obj : error LNK2019: unresolved external symbol "__declspec(dllimport) public: __thiscall MSpinLock::MSpinLock(char const *)" (__imp_??0MSpinLock@@QAE@PBD@Z) referenced in function "public: __thiscall _MLockEx::_MLockEx(char const *)" (??0_MLockEx@@QAE@PBD@Z)
2>Debug/Tester.exe : fatal error LNK1120: 3 unresolved externals